import fetch from 'dva/fetch';

function parseJSON(response) {
  return response.json();
}

function checkStatus(response) {
  if (response.status >= 200 && response.status < 300) {
    return response;
  }

  const error = new Error(response.statusText);
  error.response = response;
  throw error;
}

/**
 * Requests a URL, returning a promise.
 *
 * @param  {string} url       The URL we want to request
 * @param  {object} [options] The options we want to pass to "fetch"
 * @return {object}           An object containing either "data" or "err"
 */

 /**
  // 这块是原本的
    export default function request(url, options) {
      return fetch(url, options)
        .then(checkStatus)
        .then(parseJSON)
        .then(data => ({ data }))
        .catch(err => ({ err }));
    }

  */
export default async function request( url, options ){
  const response = await fetch( url, options );
  checkStatus( response );
  const data = await response.json();
  const ret = {
    data,
    headers: {}
  };
  if( response.headers.get('x-total-count') ){
    ret.headers['x-total-count'] = response.headers.get('x-total-count')
  };
  return ret
}